Someone posted on fm.net not long ago saying they'd spoken to ms support, who said it was a batch of faulty discs but they said it's from one store, gamestop i think, and people are reporting the same issue from asda and other stores, so it could be anything. He also said there will be an official statement within 24hrs.
Make of it what you will, but it's worth waiting until tomorrow anyway, and then start pestering ms and turn 10 all over again!
Good luck guys. No point having community features if half the community end up banned for playing their favourite game! LOL